221221231132 has 36 divisors (see below), whose sum is σ = 448635847464. Its totient is φ = 94640093440.

The previous prime is 221221231117. The next prime is 221221231159. The reversal of 221221231132 is 231132122122.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8685823 + ... + 8711254.

It is an arithmetic number, because the mean of its divisors is an integer number (12462106874).

Almost surely, 2^221221231132 is an apocalyptic number.

221221231132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221221231132 is an abundant number, since it is smaller than the sum of its proper divisors (227414616332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221221231132 is a wasteful number, since it uses less digits than its factorization.

221221231132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17397126 (or 17397107 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

Adding to 221221231132 its reverse (231132122122), we get a palindrome (452353353254).

The spelling of 221221231132 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, one hundred thirty-two".